1. A trolling device for controlling a clutch oil pressure by rotationally operating a trolling lever,
the trolling device having a pressure reducing valve for reducing the clutch oil pressure and a low speed valve for adjusting the spring force of a pilot spring of the pressure reducing valve in conjunction with the trolling lever,
the low speed valve comprising a spool connected on the trolling lever unrotatably relative to a lever shaft of the trolling lever and freely slidably along the lever shaft, the spool having one end being in contact with the pilot spring, and the other end receiving primary pressure oil of the pressure reducing valve, a notch groove for discharging the pressure oil into a drain depending on the angle of rotational operation of the trolling lever being formed on a land of the spool, the trolling device being so constituted that forward and reverse clutches are fully engaged by bringing the notch groove into a closed position and a trolling state is attained by bringing the notch groove into an open position,
the pressure reducing valve comprising a spool provided with a pilot oil pressure chamber and an orifice formed therein, the pilot oil pressure chamber using the secondary pressure oil of the pressure reducing valve as a pilot pressure and the orifice for draining oil from the pilot oil pressure chamber to a drain,
the low speed valve having a protrusion which extends inside a coil spring constituting the pilot spring to the side of the pressure reducing valve and comes into contact with the pressure reducing valve at least when the forward and reverse clutches are fully engaged,
the protrusion having a drain oil passage which comes into communication with the orifice when in contact with the pressure reducing valve during trolling to discharge drain oil from the orifice.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A device comprising:
an output terminal;
a driver circuit configured to drive the output terminal to one of first and second voltages supplied from first and second source lines, respectively;
a control circuit configured to generate a first control signal and operating on third and fourth voltages supplied from third and fourth source lines that are provided independently of the first and second source lines; and
a buffer circuit configured to receive the first control signal to generate a second control signal and operating on the first and second voltages supplied from the first and second source lines,
wherein the driver circuit is configured to control a slew rate thereof based on the second control signal.
2. The device as claimed in claim 1, wherein the control circuit is configured to generate the first control signal having one of the third and fourth voltages, and the buffer circuit is configured to generate the second control signal having one of the first and second voltages.
3. The device as claimed in claim 1, further comprising a decoupling capacitor having a first electrode connected to the first source line and a second electrode connected to the second source line.
4. The device as claimed in claim 1, further comprising:
a first external terminal connected to the first source line and configured to receive the first source voltage from outside;
a second external terminal connected to the second source line and configured to receive the second source voltage from outside;
a third external terminal connected to the third source line and configured to receive the third source voltage from outside; and
a fourth external terminal connected to the fourth source line and configured to receive the fourth source voltage from outside.
5. The device as claimed in claim 1, further comprising an internal voltage generator configured to receive a fifth source voltage from outside to generate the third source voltage.
6. The device as claimed in claim 1, wherein the first and third source voltages have substantially the same value as each other, and the second and fourth source voltages have substantially the same value as each other.
7. The device as claimed in claim 1, further comprising a fuse circuit storing the first control signal.
8. A device comprising:
an output terminal;
a first transistor coupled between the output terminal and a first source line;
a second transistor coupled between the output terminal and a second source line;
a first circuit configured to supply a first data signal to a control electrode of the first transistor, the first data signal taking one of first and second logic levels based on a third data signal;
a second circuit configured to supply a second data signal to a control electrode of the second transistor, the second data signal taking one of the first and second logic levels based on a fourth data signal;
a third circuit configured to control a changing speed of the first control signal from the first logic level to the second logic level based on a first slew rate control signal on a first signal line;
a fourth circuit configured to control a changing speed of the second control signal from the second logic level to the first logic level based on a second slew rate control signal on a second signal line;
a first buffer circuit configured to generate the first slew rate control signal such that the first signal line is connected to one of the first and second source lines; and
a second buffer circuit configured to generate the second slew rate control signal such that the second signal line is connected to one of the first and second source lines.
9. The device as claimed in claim 8, wherein
the first buffer circuit generates the first slew rate control signal based on a third slew rate control signal on a third signal line,
the second buffer circuit generates the second slew rate control signal based on a fourth slew rate control signal on a fourth signal line,
the third signal line is connected to one of third and fourth source lines,
the fourth signal line is connected to one of the third and fourth source lines, and
the third and fourth source lines are provided independently of the first and second source lines.
10. The device as claimed in claim 9, further comprising:
a first external terminal coupled to the first source line,
a second external terminal coupled to the second source line,
a third external terminal coupled to the third source line, and
a fourth external terminal coupled to the fourth source line.
11. The device as claimed in claim 10, wherein the first and third external terminals are supplied with a first voltage, and the second and fourth external terminals are supplied with a second voltage different from the first voltage.
12. The device as claimed in claim 9, further comprising a fuse circuit storing values of the third and fourth slew rate control signals.
13. A device comprising:
first and second terminals between which a first power voltage is supplied;
third and fourth terminals between which a second power supply voltage is supplied;
a fifth terminal;
a first circuit coupled between the first and second terminals and configured to operate on the first power voltage to produce a first set of slew rate control signals;
a second circuit coupled to between the third and fourth terminals and configured to operate on the second power voltage to produce a second set of slew rate control signals in response to the first set of slew rate control signals; and
a third circuit coupled between the third and fourth terminals and configured to operate on the second power voltage to drive the fifth terminal at a rate that is controllable in response to the second set of slew rate control signals.
14. The device as claimed in claim 13, further comprising:
first and second power lines elongated respectively from the first and second terminals to the first circuit; and
third and fourth power lines elongated respectively from the third and fourth terminals independently of the first and second power lines, the third and fourth power lines reaching each of the second and third circuits.
15. The device as claimed in claim 13, wherein the first power voltage is substantially equal to the second power voltage.
16. The device as claimed in claim 13, further comprising:
an internal voltage generator coupled between the first and second terminals and configured to operate on the first power voltage to generate an internal voltage that is different from the first power voltage; and
a fourth circuit operating on the internal voltage to produce a third set of slew rate control signals;
the first circuit responding to the third set of slew rate control signals to produce the first set of slew rate control signals.
17. The device as claimed in claim 16, wherein the internal voltage is lower than the first power voltage.
18. The device as claimed in claim 13, further comprising a capacitor connected between the third and fourth terminals.
19. The device as claimed in claim 13, wherein the second circuit comprises at least one inverter.
20. The device as claimed in claim 13, further comprising:
first and second power lines elongated respectively from the first and second terminals to the first circuit to convey the first power voltage to the first circuit; and
third and fourth power lines elongated respectively from the third and fourth terminals independently of the first and second power lines, the third and fourth power lines reaching each of the second and third circuits to convey the second power voltage to each of the second and third circuits;
the first power voltage being substantially equal to the second power voltage.